During superplastic flow in ferrite-austenite steels there are different changes in the phase structure and substructure; in δ-ferrite as a result of collective polygonization and transfer of intragranular dislocation to grain boundaries free of dislocations and subboundaries, a structure is formed typical for the recrystallized condition.
As a result of forming large-angle boundaries during joining of austenite grains touching during plastic flow, apart from a low dislocation density within them, conditions are created for occurrence of secondary austenite recrystallization.
As a result of superplastic flow for steels of the 0Kh12G14N4Yu3T type, both phases, i. e. ferrite and austenite, reach (although by different paths) conditions typical for a recrystallized structure, and as a result of this the steel, loses its capacity for further deformation.
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O. A. Bannykh and T. N. Pedan, "Structural changes for two-phase steels under superplasticity condition," Metalloved. Term. Obrab. Met., No. 3, 17–19 (1977).
O. A. Bannykh, L. I. Kartashova, and T. N. Pedan, "Structure of steel 0Kh12G14N4Yu2 after deformation under superplasticity condition," Metalloved Term. Obrab. Met., No. 12, 8–10 (1978).
J. Martin and J. Doerty, Stability of the Microstructure for Metal Systems [Russian translation] Atomizdat, Moscow (1978).
A. A. Baikov Institute of Metallurgy, Moscow. Translated from Metallovedenie i Termicheskaya Obrabotka Metallov, No. 5, pp. 48–50, May, 1985.
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Bannykh, O.A., Chulanov, O.B. Recrystallization features of ferrite-austenite steel during superplastic flow. Met Sci Heat Treat 27, 372–375 (1985). https://doi.org/10.1007/BF00693379
- Dislocation Density
- Phase Structure